Concrete form tie



Search Ream Aug. 28, 1945. T. R. JuDKlNs CONCRETE FRM TIE Filed July 3l, 1944 ffu dk ns ZD. i* ASIIU ULUUK ANU L search Roem Aug. 2s, 194s UNITED STATES PATENT OFFICE This invention relates to concrete form ties.

An object of this invention is to provide a concrete form tie which includes a pair of screw members and an elongated bar, the bar being positionable between the sides of the form and of less length than the distance between the form sides, so that the bar will become embedded in the concrete with the ends thereof disposed inwardly from the sides of the concrete in order that after the concrete has set and the screw members withdrawn, the holes may be plugged and the ends of the bar sealed against corrosion. y

Another object of this invention is to provide a form tie embodying a channeled bar adapted to be embedded in the concrete, a pair of frustoconical washers, and a pair of threaded members, the bar being formed with half threads, and tightening of the threaded members binding the washers on the ends of the bar when pressure is applied to draw the sides of the form together, and releasing the washers when pressure has been removed so that the washers may be removed from the set concrete.

With the foregoing objects and others which may hereinafter appear, the invention consists of the novel construction, combination and arrangement of parts as will be more specifically referred to and illustrated in the accompanying drawing, wherein are shown embodiments of the invention, but it is to be understood that changes, f

variations, and modifications may be resorted to which fall within the scope of the invention as claimed.

Figure 1 is a horizontal section through a concrete form having a form tie constructed according to an embodiment of this invention mounted therein, the form tie being shown in top plan.

Figure 2 is a sectional view, taken on the line 2 2, of Figure 1.

Figure 3 is a sectional view, taken on the line 3-3, of Figure 2.

Figure 4 is an end elevation of one of the conical washers and guides.

Referring to the drawing, the numerals I and II designate the opposite sides of a form having walers I2 on the outer side of the form IIJ and walers I3 on the outer side of the form I I.

In order to provide a means whereby the two form members I0 and I I may be held against outward bulging and also held against inward movement relative to each other, I have provided an elongated bar I4 which is adapted to be positioned between the inner sides of the two form members I0 and I I. The bar I4 is rectangular in transverse section and is formed with a longitudinal channel I5 having fragmentary threads I6. The threads I6 are square threads and extend throughout the length of the upper side of the bar I4.

A combined guide and pressure washer I1 engages about one end of the bar I4 and is of frusto-conical configuration. 'Ihe guide I1 is formed with a substantially rectangular bore I 8 therethrough and the upper side of the bore is rounded 'as at I9. A second combined guide and pressure member is disposed at the opposite end of the bar I4 and is constructed in every detail similar to the guide I1. An elongated threaded shaft 2l extends between pairs of the walers I1 and engages through the rounded opening I9 of the guide I1. The inner end of the shaft 2l is threaded on the fragmentary threads I6, and as the shaft 2I is threaded inwardly the bar I4 will be pulled outwardly. A nut head 22 is carried by the outer end of the shaft 2I and a plate 23 engages between the pair of walers I2 with a washer 24 interposed between the plate 23 and the head 22.

A second threaded shaft 25 is threaded into the opposite end of the bar I4 engaging through the guide member 20 and being disposed between the pair of walers I 3. A plate 2B is positioned between the two walers I3 through which the shaft 25 rotatably engages, and a washer 21 is interposed between the plate 26 and the nut head 28 carried by the outer end of the shaft 25.

In the use and operation of this form tie, the bar I4 is positioned between the two form members I0 and II, being of a length substantially less than the distance between the inner sides of the two form members. The guide members I'I and 20 are slipped over the opposite ends of the bar I4 and the two shafts 2| and 25 are then extended through the guide members I1 and 2li respectively and threaded into the channel I5 of the bar I4. As the shafts 2| and 25 are threaded inwardly and pressure exerted to pull the bar I4 endwise in opposite directions, the shafts 2| and 25 will have a tendency to ride out of the threaded channel I5. The guides I1 and 20 will prevent the shafts from riding out of the threaded channel I5 and pressure will be exerted in the guides I1 and 20 by the shafts 2I and 25 respectively, which will tend to wedge these guides against the inner sides of the form. In this manner, the forms I0 and II will not only be held against outward bulging by the shafts 2I and 25, but will also be held against inward distortion by the pressure of the shafts within the guides I1 and 20. After the concrete has set, the shafts 2l and 25 may be unthreaded and removed from the set concrete and the forms il and Il removed from the opposite sides of the concrete. The guides I1 and 20 may then be removed from the opposite sides of the concrete by striking these guides or inserting a tool in the opening I8 and applying a twisting pressure.

When the guides l1 and 20 have been removed, the bar Il will remain imbedded in the concrete with the opposite ends of this bar positioned a substantial distance inwardly from the outer sides of the concrete. The holes left by the guides l1 and 20 may then be lled with concrete so that a smooth outer surface will be provided and there will not be any metal on the outside of the concrete which will corrode the concrete. The threads I6 in the bar Il may be formed by stamping, casting, or the like, and in practice the bar I4 may be made of relatively long length and desired short lengths cut from the long bar so that these short lengths will be substantially less than the space between opposite form members.

What is claimed is:

1. A concrete form tie comprising an elongated bar substantially rectangular in transverse section and formed with a longitudinal threaded channel in one side thereof, a pair of substantially truste-conical guide, members formed with openings therethrough for receiving the ends of said bar and a pair of threaded bolts engaging through said guide members and threadably engaging said bar whereby tightening of said bolts will draw the opposite sides of the form toward each other.

2. A concrete form tie comprising an elongated bar substantially rectangular in transverse section and formed with a channel opening through one side thereof, said channel being threaded throughout the length of said bar, said bar having a length substantially less than the distance between a pair of form members, a pair of Irustoconical guides having openings for loosely receiving the ends of said bar and a pair of threaded bolts engaging through said guides and threaded in the channel of said bar, tightening of said bolts effecting a wedging of said guides against the inner sides of the form.

his THEODORE R. X JUDIQNS.

mark

Witness to mark:

CAROLINE WILLBANKS. 

